CVE-2025-20184 in Secure Email
Summary
by MITRE • 02/05/2025
A vulnerability in the web-based management interface of Cisco AsyncOS Software for Cisco Secure Email Gateway and Cisco Secure Web Appliance could allow an authenticated, remote attacker to perform command injection attacks against an affected device. The attacker must authenticate with valid administrator credentials.
This vulnerability is due to insufficient validation of XML configuration files by an affected device. An attacker could exploit this vulnerability by uploading a crafted XML configuration file. A successful exploit could allow the attacker to inject commands to the underlying operating system with root privileges.
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Analysis
by VulDB Data Team • 08/08/2025
This vulnerability resides within the web-based management interface of Cisco AsyncOS software deployed on Cisco Secure Email Gateway and Cisco Secure Web Appliance devices. The flaw represents a critical security weakness that enables authenticated remote command injection attacks, fundamentally compromising the integrity and confidentiality of the affected systems. The vulnerability stems from inadequate input validation mechanisms within the XML configuration file processing subsystem, creating a pathway for malicious actors to execute arbitrary commands on the underlying operating system with the highest possible privileges.
The technical exploitation mechanism leverages the insufficient validation of XML configuration files, which violates fundamental security principles outlined in CWE-94, which addresses "Improper Control of Generation of Code ('Code Injection')." Attackers with valid administrator credentials can upload maliciously crafted XML files that bypass normal validation checks, allowing them to inject system commands directly into the device's operating system. This privilege escalation occurs because the vulnerable system fails to properly sanitize or validate XML content before processing, enabling attackers to manipulate the configuration parsing logic and execute arbitrary code with root-level access. The vulnerability essentially creates a backdoor through which attackers can gain complete control over the affected appliance.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with unrestricted access to the underlying operating system. This level of access enables comprehensive system compromise including data exfiltration, system modification, and potential lateral movement within network environments. The vulnerability affects organizations that rely on Cisco Secure Email Gateway and Cisco Secure Web Appliance for email security and web filtering services, potentially exposing sensitive communications and corporate data to unauthorized access. The authenticated nature of the attack means that compromise requires valid administrative credentials, but once obtained, the attack can be devastating as it provides complete system control without additional exploitation vectors.
Mitigation strategies should focus on immediate credential management and access control measures, including implementing strict administrative access controls, regular credential rotation, and monitoring for unauthorized configuration changes. Organizations should deploy network segmentation to limit access to these devices and implement robust monitoring solutions to detect suspicious XML file uploads or command execution patterns. The vulnerability aligns with ATT&CK technique T1059.001 for Command and Scripting Interpreter and T1566.001 for Phishing, as it enables attackers to execute system commands and potentially expand their access through these compromised devices. Cisco has released security advisories and patches addressing this vulnerability, which should be applied immediately to prevent exploitation. Additionally, implementing network-based intrusion detection systems and regular security assessments can help identify and prevent exploitation attempts before they succeed.